Which statement describes the hymen?
A. An annular hymen hinders menstruation.
B. Hymens are not reliable indicators of virginity.
C. An imperforate hymen has several openings.
D. The hymen is present in all human females at birth
B. Hymens are not reliable indicators of virginity.
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A DNA molecule used to carry a foreign gene into a host organism is called a
A. plasmid. B. probe. C. vector. D. blot.
If part of a DNA template is the sequence GTTAGTCTGTGGGCT, then the DNA coding strand has the sequence
A) GTTAGTCTGTGGGCT. B) CAATCAGACACCCGA. C) CAAUCAGACACCCGA. D) GAATCAGACACCCGA.
As water flows into the osmometer, the pressure measured by the instrument ________
a. increases. b. decreases. c. never stabilizes. d. slowly falls to zero.
Can a theory be proved wrong?
A. No, theories are the same as facts. B. No, because there is no good way to test a theory. C. Yes, a new observation or interpretation of data could disprove a theory. D. Yes, theories are the same as hypotheses.